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From ABC News headquarters in New York City, this is GMA3.

A sunny and somber day here in New York City. This is GMA3. A sunny and somber day here in New York City. Welcome to GMA3. Hello. I'm Rebecca.

And I'm Stephanie here with Elizabeth and we're so glad you can join us on this Thursday. Today we're commemorating the 24th anniversary of 9-11. And that is a look, a live look, at the 9-11 Memorial in Lower Manhattan.

Nearly 3,000 people were killed at the World Trade Center, the Pentagon, and in Shanksville,

Pennsylvania, families of the victims gathering to remember them.

We do have a lot to get to, including families getting back into the swing of back-to-school.

We have expert advice on everything from getting on track with schedules to making healthy food choices to making friends.

Also ahead, we are looking at a new study on chronic insomnia and dementia risk.

And what you can do if you think you suffer from insomnia, Chief Medical Correspondent,

Dr. Territ Neurola is here.

But first we turn to the shooting at a Colorado high school.

The suspected shooter is dead, and our Trevor Alt is on the scene at Evergreen High School in Colorado.

Trevor.

Well, Stephanie, of course, there is no school in session today, but the parking lot has still been full all day,

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